513366891881 has 16 divisors (see below), whose sum is σ = 563914828800. Its totient is φ = 465174336528.

The previous prime is 513366891841. The next prime is 513366891887. The reversal of 513366891881 is 188198663315.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 513366891881 - 2²² = 513362697577 is a prime.

It is a super-2 number, since 2×513366891881² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 513366891881.

It is not an unprimeable number, because it can be changed into a prime (513366891887) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12223340 + ... + 12265266.

It is an arithmetic number, because the mean of its divisors is an integer number (35244676800).

Almost surely, 2^513366891881 is an apocalyptic number.

It is an amenable number.

513366891881 is a deficient number, since it is larger than the sum of its proper divisors (50547936919).

513366891881 is a wasteful number, since it uses less digits than its factorization.

513366891881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69988.

The product of its digits is 7464960, while the sum is 59.

The spelling of 513366891881 in words is "five hundred thirteen billion, three hundred sixty-six million, eight hundred ninety-one thousand, eight hundred eighty-one".